Use nginx for ssl proxy to jenkins to make system more secure

Install and configure nginx as ssl proxy for jenkins. The ssl certificate will be automatically generated if no mdata variable nginx_ssl is set. Jenkins will only listen on localhost, so only a secure connection via nginx is possible. The version of the mibe image has been increased.
Our build environment require a base image

The base64 image (14.2.0) has been selected as base image for the moment.
Fix folder path for the nginx ssl certificate
Add some logging information and enable nginx by default
Fix missing t for default
Add `proxy_redirect` for jenkins, it still require a config of jenkins itself
Update to new version 1.583 of jenkins
upgrade to jenkins v1.584
only force ssl if metadata is provided

still use nginx as a reverse proxy for pure http
bump image version